SmogRank / United States / West Virginia / Charleston
Charleston, month by month
Charleston, West Virginia has a measured daily mean on 1,295 days since 1 January 2023. Its worst month was June 2023, at 61 US AQI (14.2 µg/m³), 426th of 1,603 cities on that month's world ranking. Its cleanest was May 2025, at 29 US AQI (5.2 µg/m³). 2025 averaged 39 US AQI (7.0 µg/m³), against 39 US AQI (7.0 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
1 month
| Month | Why |
|---|---|
| Mar 2023 | 17 of 31 days measured; a month needs 22. The others: 13 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Charleston's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 6114.2 µg/m³ | 426thof 1,603 | Eastern United States and Canada, May and June 2023 |
| July 2026 | 5310.4 µg/m³ | 1,259thof 2,784 | Northern United States and Canada, July 2026 |
| November 2023 | 529.5 µg/m³ | 744thof 2,243 | Eastern United States and Canada, November 2023 |
| February 2026 | 519.1 µg/m³ | 1,638thof 2,866 | – |
| August 2025 | 498.8 µg/m³ | 1,551stof 2,901 | – |
| July 2024 | 488.6 µg/m³ | 1,137thof 2,566 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Charleston's worst days
| Day | US AQI | Episode |
|---|---|---|
| 8 Jun 2023 | 8829.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Nov 2024 | 8627.7 µg/m³ | – |
| 20 Jul 2026 | 8426.6 µg/m³ | Northern United States and Canada, July 2026 |
| 9 Jun 2023 | 8226.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 8225.8 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 6 Nov 2023 | 8225.8 µg/m³ | Eastern United States and Canada, November 2023 |
| 8 Nov 2023 | 8024.8 µg/m³ | – |
| 2 Jul 2026 | 7924.0 µg/m³ | – |
| 17 Jun 2023 | 7723.3 µg/m³ | – |
| 17 Jul 2023 | 7722.8 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Charleston, West Virginia, United States, 1 Jan 2023 – 10 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/charleston-west-virginia/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Charleston now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).